解决CentOS7关闭/开启防火墙出现Unit iptables.service failed to load: No such file or directory.

CentOS7中执行 service iptables start/stop 会报错Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory.tcp 在CentOS 7或RHEL 7或Fedora中防火墙由firewalld来管理,rest 若是要添加范围例外端
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